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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b5002680bfff7c8df070b4cd90a97ba63e9aeb8805e634ec50cbf9ed42b48e2' 
  AND token = '0aNe3XyUuU7vEyicSNPB/CSft3Xrcy5puGFfQfr/cEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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