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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48992d8e00fdf9b95270559a2893255be3bf3af5b22f547efd4c57e9e15160a7' 
  AND token = 'NruPgDP3C9/337HD/3UBELKDZev2+sTJ0vmAceuGW8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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