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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab3ef68dc5852257751085d86ec661206d2b0fdcb6f1f2de384f5ed07b8411af' 
  AND token = '/2IB5mElyNKS5zPTg3N+ovCuNCM+0+LWrZBZTigGnzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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