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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18678d4c6ea9562616ed7f8495794705d88d0075a885accb2401a4c5d02ce801' 
  AND token = 'dFg94pfZygUwTS5OUJf77jGOVxP5JVMj5lg4pFA5U+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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