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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ebf707a4d63ebd8a143291c36898f9906566a63e7b308209bdf0839d2662f9c' 
  AND token = 'x96Woe30pf7T5THfx9tbVRUA6PvCp10BKqqgAcf4GvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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