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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dc370a3570aca3b5ed8e458e6f33cdc5753e821052fd2df408ff8f2181ede77' 
  AND token = 'VcuTscgnxIICyQMEb1qSOjcnT8HJOlIpVHT4vzBPt4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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