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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0424c17f6f5ae0e80eeaa3caf601d0260e521dce65c07691c9ddbd50c186070c' 
  AND token = 'sBYk7R+9SSkie1Ynx6KugOQJT4VVCVMzVY4/clTsMNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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