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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c20ee6c2f5806c27632abba0479336da72037bf9f3736d1fa83aa59255742f82' 
  AND token = 's1oPt/e1IOhA4xqIkswDDH09ntQO+o3kYbOifOoh+Vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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