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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49a0d377d794dbe2de3506670324015ae317bc7094fde3f16a6608d8aab10683' 
  AND token = 'h8fzu/Nstf2/AUhfVqnzy7BOenD95NnVJaBA6JzRhN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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