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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72e305039b5a5d7f46216a97bbe2f44c29efa18c4af1bdc42452e16c5e455609' 
  AND token = 'sTm4+tb7CDp3pcr0kThOA0erHz+g3akfOGZxUnvOzHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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