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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56f1863a58d5b249e10a4ae4b2407fe5bcd29284f7be17fb9d7fb7dfdf5255a0' 
  AND token = 'kXaWrrWKTyYJx1oaMEbpfuBVSYU5Y7QBr5UJ3v+v1+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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