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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f2587990592108a7d25282128bb821a42daf374936b4468b425b12bb09f61cd' 
  AND token = '3bgL1i8o6I4SQGm0Bpgpmoj8J7sEsJBZmSTyALVIuPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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