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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e6d15c6694f919602dec82fa502670c0dd1dad143c92234b769bcf92d2151fe' 
  AND token = 'QZcZ/nykotedG90EviHzZbjvOakvdMSGhBCODS1SwhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}