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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f277b5ba4c6e9748a9dfe2d182329a57ccfec9a99b3a4ec778e72dcd8d5174fd' 
  AND token = '4BmiCwyqvBJLbVMQJX+3szckHFuutV/l7J5bGIb7RaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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