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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '955ee3f9714f876ffdf7be9613580f2fb6de903c561b4cf09e416ce80547b94f' 
  AND token = 'bcCJ9ykHBS5pUZlOGJrYg6Q4Jxlww5NEDlUoWEFQM7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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