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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40443652ca41901d242f92e802aea6c1950669a34660b98b286730e992776757' 
  AND token = 'aqasmx5L+GmCBVztU9lZCwXUkExFnEy6HQbFOKFInEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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