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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d5eadfefbaba0e29bdaed4fa3505a3e82312281159151f0ab981f9ba6958b0c' 
  AND token = '290vxINg8FNHv++w5vgHcY33lQyZUug50sPK5ntSUzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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