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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4c5839cb5a0fecb3a113ea5a98a55e8d8eacebc88d5f69a5f7a86c18dd606c4' 
  AND token = 'jsDouiIk7WvjCGVeBiNis/BpVRjkRmz9Z9Qhsay5RX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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