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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c16ba86679f7bd81e9633ba006d6d1bcb173cdea51096a65d53a838173a26244' 
  AND token = 'e5fjv5e3a78MkHQ18QQfuQSp0jJ+H5ek+rMaQy+Adgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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