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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c4f3aba95d61e68b8fa30e1b091f0c31da3914632efa9b8d746e241d688efb2' 
  AND token = 'kt0W6096hTBjAtqjpJrycbZvp32zpr3ac12c/1LwK3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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