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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64e0cb2c4d5f3675023b3a9a056a2cf7a319c44e1245784dacecc1040714d4e9' 
  AND token = 'JQkQ/xvhVLB7rM6Grb213M+G2j4+7/w049w8PKJGM5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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