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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd09836110b015da774e916d3db497a4d127e908664d243f801c869013aab6708' 
  AND token = 'mN86MoYmC7PMkaOmBAKk/kFF+RMr2mfNiA1I5UO8hBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00094

JSON explain

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