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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a59fab64f31740747526274bf0a71df17f46d3cda980b24785e8615b37ba338' 
  AND token = 'hAoTLcCcQxdl4d1uYNdR5825k94e6ck82fUwcHqcny4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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