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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76ab6accef8d00d11caba8cb23991054b9640a749d634ba2801bc248ca2131bb' 
  AND token = '+VSdR5/VB90NeC/WFezQN9TGZE6MhEnUSpyucrox+NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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