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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9db751ef4c5ad987870b1410cb5a8b5bf71c214fe2378506a6866b831d0d1772' 
  AND token = 'MWJJwpA7XJv1XuZip+ytH5yLI4WaC9eWUSTwmHVcPvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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