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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06daeac0cc1c6d6eacbeaa844ce6dd9e1ccf3df5801fd6f0e87d931065eb49be' 
  AND token = 'B+ACrUV/DswHKm+8DN48jeYh0NhX7baFb2cangGjgRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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