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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5937fd4e3c4937ca26b4de121404aaa4a3d9a218d39f288203a6f8037f8fdc5' 
  AND token = 'zNpcB9YPTvi3n7iz3gNQdVvkD7F4s/CoH6PdreXMMaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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