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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad0497c2a6f3255af0d7b7882a87ea09a1b437a3dda4a4c8570b468509f218f6' 
  AND token = '4Eh430NdR58r/5iNEI1UPryCw89MEx1FDgBZH17B33A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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