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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a884ad98e34eae866a5d9cfdbcc0b44dfea4b9638cc9cb4d1e6c0ce92963f5d' 
  AND token = 'vqCUQbrHVwVI4M436MH74Vv2y3SA+eUpVRIIthHLFzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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