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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d0b91b4dea809a9727a6bee280039df1e9f4219375b4f58320319cba6a4ed7c' 
  AND token = '/Ei1u6DHTZcCR+M6PXPO51jVtlstJQof99K/kMIU8pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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