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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac537ee1e4c7b73b700b90c19483624844b946cb4945056f944f5e6ce33a0474' 
  AND token = 'VG8m1tf00gb/RroJKO57jMm9+11GTbpJJt837gcl5u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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