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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9caaabc643c1e9535fcdf0c3ade400db0b3f7f07afcdbb9e26f73edfab6cdfc0' 
  AND token = 'Jb/W24N7ThdxwaeZr5p2eVlnklZkX5GV35BY1eU7DIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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