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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c0053f84406551f79417d243a4561b9a02a02d507398265748642db47d8efbf' 
  AND token = 'j7U6yxyNM/0pp8wfxBRnA4lxRiOjtphkUGV77gQwwKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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