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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92675ec0b176e676752ab042cb50292b0b790a17f852ac506d73723b019f54a3' 
  AND token = 'q44z3rM+OU+U/WokmVOpsvIazyK1n909VDqxNKvGVqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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