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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '555d229cf57747a704ac4de3c156d0a394a932de2f0bcb3caa0b582fbc1a2a84' 
  AND token = 'zUJH5iQE6ncT5ybQpIdo+bA0rDMXmaodc37uwTjG8pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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