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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5488f798354797fdfdab92a164046b2bba1eee31ca6db9ccc50f3a29f611cf91' 
  AND token = 'A9xo1Wv51UjHA1vcP/QrQufU7+RERQJqksXGDiVubRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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