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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a35fbbac2911babf476c44726f03a6dbabacea431a5f893ec4a157b0d427e9b' 
  AND token = '29r1gHxSqSoG3ggWq0b139axD6S7nYaCGm9JN08N3iE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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