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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dc8b7b17ba2fcb1ca1bca3e4c13153286a887b3279d2034aa5ae1c80eefe5e0' 
  AND token = '24E0/U0gyUoq9dLa2ULZcLeUv69Jb+I4O6c2HqnEkSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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