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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1206c799a8d2615af8b0856d5a25c8340ccf8995e3c81d7b62018a294e943f07' 
  AND token = '5NAjbjaWr4z3wlGfWu1CuN+FCe5en1KpPhBlFXjwazM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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