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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ad970dd9a6c93e76cb5c05533088396c7a8ba4afa724fb185265231711f5daa' 
  AND token = '/EbWhHOrmzM/cs9NbHnGr32fo1J6+i30OK/ftVfWiMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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