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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5db2f78c658c0844be33ea858318ce129c4e98f8a5cb4928d5fae953e8baa34' 
  AND token = 'Z34tLyc3W+RlvzPopjyfHBZldKVmqZxBqk8cFZ3PShk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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