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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8fe7597104c19cdd2cf0b0078b57b5ec022bf9dbc24bc2d5f5dd15cbc4b5b76' 
  AND token = 'w/Aj8i20dCMEnCnZwZ3ZlMOiQtjhzAC6P91sMGZ9s5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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