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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '642e36f4c5ce1f3f93e8990d9b63972ab42e55ac583686f4464646f9efe9ceae' 
  AND token = '/mSh1c6Ihr4r3RpiFq4MTU+QN2JslAwtjlQXk9PSG24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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