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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '343ee6958a26e296d3f6b1b9c85a73cb832d08277b2b250e5166840b859c0fc7' 
  AND token = 'b/8Opat+dTMmRSjDNIl9NdBn7ZQ2LMr48j0J9x96MIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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