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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '259fbb64de559a0ed64b3ac424e6a2daf6e1f6e28dd74efc2b5d1f518467c941' 
  AND token = '0cXgKJJQpyhOwO37xZkIeu6sNNL6picnA0hmYpybVbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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