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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9b7bd689286df4352d64ac49d04b79be3e2bc199e8a5f8b87c0dd803b33380c' 
  AND token = 'no4TLAxVYjIzWgH9a9ZmlG3KE1m9JmWz6pMd0W2wfkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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