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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfb94a3714637d9977e8e2869c85e589451ecaf5ed35208966435464e0998b14' 
  AND token = '4K1nL5sBUfy4hY4c4gVduza0Bom8EuozADySDmidcIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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