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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90e12667abde6ff051bca07180f5c9cfe98d887158ccea1df092f95f1a9372ba' 
  AND token = 'MaYGKaQpHYO0iVT58zAD9G2Pc9a+XrqlR9L6k4+hgng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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