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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '755e082c6583f01f40fd15e8d927072afea94d9570ff837b00c61793e7c9b070' 
  AND token = 'hJjWOZ4McTMBBOR4Da1yQ0Q25NHS6kqKN+NozT799GY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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