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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eeb3fc58d40f16c8b8df31b4417d10fa93c805aa8fe7cc8118feb03b28fdd4c' 
  AND token = 'rm5Ew7MhDk9+B2f78H1s67emU7610aX+SFref+FZcgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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