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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '633f0496339d0a0adccc10d3346371c1e5b89cf0fc8cfd7b5b2833dae9624d92' 
  AND token = 'pkBLM5MA8eaV7/j/afu7F0MMykdNlznLI4iR+2tLYdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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