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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afea306e77844c1ed9022cd93b01e233d205f5e2326140e56bc89c30cd173205' 
  AND token = '1lEDa4HhJl7v25jKS3jGpuq1BCgFhKIJb23cbCSnGvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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