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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36ed91340a772f102b71e891707926bb2ec8440dfab93dbd5dfb794fda2385ae' 
  AND token = 'ISMw5PR3UhhKga+64MwO86CTLwJV+dM5DPldFy9Hp1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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