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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fea5ff9bb6f66b66df3f31d5cef6f163ab69b75da01922efd40519b9984ae22f' 
  AND token = '5G4oumuBDkUvBXS8aSbfYgfrw9gXPIyeamX3b7+fOaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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