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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fe6b519614178d551758f65d44fc0ae72bf1f06307627369b504bd842a97445' 
  AND token = 'RT+J6mXy6rv3LxBLms5voA+JiMHhD7DiPvvt2MM0gN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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