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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3d3fdbcea7bcaf619ecf1c7886ea1d0608e043f56d457289e844ad68d14a6c7' 
  AND token = 's2W30uIzBt1svCiz74j5Qe+rl7Wrgnd1TgG/aP0uM3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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