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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c3797d2e5164499346deb07c65b9c812a589420c5da81d0b77cb74b5bb7bf03' 
  AND token = 'SRE2S0ebw8h0WaQJ+Ly8BkoDaGBjrCnILUe5U1D+09c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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