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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ef256a1d40c0c2995101f8af27063555ce2ffaa716433136c78272774533211' 
  AND token = 'uUhN216dQKbNt62Sc5iM8u5W9WYPK1t7TSOCIFl+Nho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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