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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5730cf2f38f4cceaa9acdde5b812e211423ef9b481eb2ff53bbd4539f2ac5cbb' 
  AND token = '9JvnmEanIrQGv5z2Zo8b9Uoc0BqlyJVpE9p8ZBI1dvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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