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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e028b3cea0fe21813891573efe5638d3be1b55a1a3ad7cef2e67ca58dc633a34' 
  AND token = 'E9+3AvUB0nSA/+LIms/+KLOcUrzASdbgX0cWIbgpLL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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