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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c523de67787fb2c2156be8780076296cbaa68de87ab2902188bbd8f914c241f' 
  AND token = 'jf0NQ8dNLhasvo2niE4k3VWXUqC73Es74e7EbO6jwwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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