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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '235d14c48a5d00792452986d0e49611a0db37d66f45026a85e170553d4ecb4d2' 
  AND token = 'LZIDZIo62xe8g2QpkicNleS8Fxn9e+0l9xON8qpbg2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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