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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '849b0c3845afdde4562558207fe9fc3d6099e5b6dcd104930521540b32b79c79' 
  AND token = 'myud56FHx7I39I5ZRdCBWOk6988ta10yyB7HC2rfryw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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