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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37da2850485e5aeae052e43e054dc61b155595c1f4ab29354e587168a2728b18' 
  AND token = 'oN0cWBu5QEO1oW2RWkWnUYrSCaH593NEdw+M5aEA8QA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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