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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b80aa9a8826d77b063a3c2f6b02ab8d24c06d34636bd60937fedb0e49144aeb' 
  AND token = 'JdgfeM8WHoGDTgzYI71IC7a9BxaejI0dgBbGTGae14c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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